The claims declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free.".
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Colonists who lived in the region where the proclamation line did not touch, were angered because they were forced to move towards the cities and ocean. They felt that choosing a home was more important than being under a monarchy that would move them away.
Because the form of government they picked allowed for people to show opinion freely and a free vote